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I must be really dense, LOL

According to the title, and from http://asciivalue.com/index.php that char you are referring to is ASCII char 151 according to asciivalue.com:
...

Off hand, you do not need either devices when the laptop is closed.

Have you looked into disabling both when the laptop is closed and (re)enabling when opened?

realloc() is not guaranteed to reallocate in situ, which is why you do
str = realloc(str, mem); rather than realloc(str, mem); The next_read variable should be reset with something like next_read =...